Anderson, J;
Heathcote, A;
Engstrom, D;
Ryves, D;
Mills, K;
Prairie, Y;
del Giorgio, P;
... Myrbo, A; + view all
(2020)
Anthropogenic alteration of nutrient supply increases the global freshwater carbon sink.
Science Advances
, 6
(16)
, Article eaaw2145. 10.1126/sciadv.aaw2145.
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Abstract
Lakes have a disproportionate effect on the global carbon (C) cycle relative to their area, mediating C transfer from land to atmosphere, and burying organic-C in their sediments. The magnitude and temporal variability of C burial is, however, poorly constrained, and the degree to which humans have influenced lake C cycling through landscape alteration has not been systematically assessed. Here, we report global and biome specific trajectories of lake C sequestration based on 516 lakes and show that some lake C burial rates (i.e., those in tropical forest and grassland biomes) have quadrupled over the last 100 years. Global lake C-sequestration (~0.12 Pg year−1) has increased by ~72 Tg year−1 since 1900, offsetting 20% of annual CO2 freshwater emissions rising to ~30% if reservoirs are included and contributing to the residual continental C sink. Nutrient availability explains ~70% of the observed increase, while rising temperatures have a minimal effect.
| Type: | Article |
|---|---|
| Title: | Anthropogenic alteration of nutrient supply increases the global freshwater carbon sink |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1126/sciadv.aaw2145 |
| Publisher version: | https://doi.org/10.1126/sciadv.aaw2145 |
| Language: | English |
| Additional information: | © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL SLASH UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10091588 |
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